Improvement in photographic cameras



J'. 0. JEWETT & P. F. LEONARD;

PHOTOGRAPHIC CAMERA.

Patented March 6,1877.

NFETERS PflOTO-LITHOGRAPHER. WASHINGTON. D c.

UNITED STATES PATENT OFFICE.

JOEL 0. JEWETT AND PETER F. LEONARD, OF MACON CITY, MISSOURI.

IMPR OVEMENT IN PHOTOGRAPHIC CAMERAS.

Specification forming part of Letters Patent No. 187,976, dated March 6,1877; application filed September 18,1876.

To all whom it may concern:

Be it known that we, JOEL 0. JEWETT and PETER I LEONARD, of Macon City,in the county of Macon and State of Missouri, have invented certain newand useful Improvements in Photographic Instruments; and we do herebydeclare that the following is a full, clear, and exact descriptionthereof, which will enable others skilled in the art to which itappertains to make and use the same, reference being bad to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specification.

The object of our invention is to produce an instrument for making largephotographs of any size desired from any size negative, or a largepicture from a small negative, or vice versa, and to do this without theaid of a con- (lensing-lens.

The invention consists of an elongated tapering case, divided by aseries of partitions, and having the lenses for taking the negatives atthe smaller square end of said case. The lens-tube is provided with anadjustingrack operated by a pinion on a small shaft with thumb-nut. Inthe front end of the square part of the case is an adjustabletubeeylinder, operated by a thumb-screw at its lower end. It alsoconsists of a hinged cover for printing the pictures after the negativeshave been taken.

In the accompanying drawing, Figure 1 represents a top view of ourinstrument. Fi 2 is a vertical cross-section on line 00 m.

In the drawing, A is the outer case or shell, consisting of the smallersquare end divided by a partition, b, from the rear end of the case. Inthe partition is secured a tube, B, through which the negative lens-tube0 slides backward and forward, and it is operated by a rack, c, andpinion d, secured on a spindle, 6, having a thumb-wheel,f, on its outerend.

In the extreme forward end of the square part is a square tube, 9, whichmay be adjusted by a thumb-screw, D, arranged on its lower end, movingin a slot, h, and secured to a guide-plate, i. which is attached to thesquare tube g. The upper side of the square part is provided with ahinged lid to facilitate the introduction of the hand for any purpose.

The rear end of the case A is tapered from the square part, and isdivided by a number of partitions, k 70, and has a hinged lid, l,attached to one side.

The great advantages of our instrument are, that any desired sizenegative can be taken, a large picture from a small negative, or viceversa, and this without the aid of a condensing-lens.

The instrument can be constructed at a very small cost in comparisonwith those now in use, an ordinary one not costing more than fifteendollars, while those instruments with condensing-lenses, that take thesame size picture, cost two hundred and seventy-five dollars and upward.

Another advantage is that it does away with the expense of a man or boyto attend to the register of the instrument while printing the picture,which is also a great saving to the photographer.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is-

The partitioned camera-box A, provided with a movable lens-tube, c, andadjustable tube g, attached to, and moving with, the guide-plate t,substantially as described, and for the purpose set forth.

In testimony that we claim the foregoing as our own we hereby affix oursignatures in presence of two witnesses.

JOEL 0. JEWETT. PETER F. LEONARD.

Witnesses:

EDWARD S. GoLnsBEnv, WILLIAM G. BELSHE.

